This pattern from the Blomqvist and Persson book Tatting Patterns is the one I would choose. It shows off variegated threads like a dream. This is a machine embroidery thread from Gütermann, very fine. It is a quick pattern, and yet I feel it has a light lacy look that is very satisfying. I often use it to try new threads, as I have lots of old samples to compare them to, like a tension sample in knitting.
|This is Yarnplayer's Tourmaline, size 80.|
|These were made using Valdani 50|
|The green is Gütermann Sulky, the navy is Caen lace thrad.|
|Tatskool's beautiful daffodils, in size 80.|